Electronic keyboard



FIG. 1 is a perspective view of the front, top and right side of an electronic keyboard showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken line portions show unclaimed subject matter only and form no part of the claimed design. 

CLAIM The ornamental design for an electronic keyboard, as shown and described. 